Valve for liquid meters



Jan. 17, 1933. D. H. MCGOGY VALVE FOR LIQUID METERS Filed Dec. 9. 1930Patented Jan. 17, 1933 UNITED STATES DONALD H. MCGOGY, MCMINN'VILLE,OREGON VALVE FOR LIQUID METERS Application led December 9, 1930.` SerialNo. 501,120.

The present invention relates to valves for liquid meters of the typeillustrated in Letters Patent, No. 1,694,747, granted December 11, 1928,and No. 1,814,725, granted July 14, 1931, to my assignee, McGogy PumpCo., Inc. and an application filed January 17, 193.0, Serial No.421,483. In liquid meters of the stated type, there is provided a bodyincluding a central chamber and a plurality of cyl- 0 inders radiatingfrom the central chamber. Pistons reciprocate in the several cylindersand are connected in common to a hollow crank shaft which is disposedcentrally in the top of the central chamber Vand is connected to a valvewhich controls the inow and outflow of the liquid. The inflowing liquidpasses to the outer end of a cylinder and then into the cylindereffecting an inward stroke of the piston, while liquid is simultaneouslyexpelled from the alined cylinder by the outward stroke of the connectedpiston, and during such operation of the pistons, the crank shaft andthe valve are rotated so that the inlet and outlet passages will besucces- 5 sively connected with and cut of from the various cylinders.The valve is substantially a disk having an eccentric port which isadapted to aline with the liquid passages successively so as to admitliquid to theres ective cylinders, and also having an arc ed portionadapted to successively connect the various liquid passages with theupper end of the hollow crank shaft so that the liquid expelled from` acylinder will be directed through the crank shaft to the central chamberof the meter and thence flow to the point of use. The liquid whichentered the meter iowed over the top of the valve to reach the eccentricport and the passage alined thereo with and the .pressure of theiniowing liquid was borne by the valve. Under. normal conditions, thepressure above and below the valve was balanced, but if there were asudden check in the operation of the meter there would be an increase inback pressure under the valve which caused damage to the parts of themeter and affected the accuracy of the readings. This condition has beenmet by so connecting the valve to the crankshaft that while it willrotate with the shaft it may move upwardly thereon suiciently to relievethe back pressure. It frequently happened that the pressure exerted uponthe top of the valve by the inflowing liquid would create excessivefriction between the valve and its seat, causing unnecessary head lossand inaccurate measurements. The present invention has Vfor its objectthe provision of a valve in which the pressure exerted upon the valvewill be borne by the crank shaft and the valve may yield to excessiveback pressure without caus- 'ing inaccuracy in the reading of the meter.

A valve embodying the invention is illustrated in the accompanyingdrawing and will be hereinafter fully described, the novel featuresbeing particularly defined in the appended claims.

In the drawing:

Figure 1 is a plan view of the valve,

Fig. 2 is a diametrical section` of the same, 70 the position of thebonnet or dome whichcovers the valve and its seat being illustrated bydotted lines, and

Fig. 3 is a view similar to Fig. 2 but 1llustrating a variation in theconstruction.

In the drawing, the valve is indicated by the reference numeral 1 and itwill be seen at once that the valve is a circular member having a portor opening 2 therethrough at one side through which the liquid may flowto enter a cylinder of the meter and at the opposite side being providedwith a port or opening 3 through which the liquid may How as it isdischarged from the meter cylmders. The valve is connected with thecrank shaft 4 in any suitable manner which will cause the valve torotate with the crank shaft but will permit it to have a slight verticalmovement relative tov and independent of the crank shaft, as is shown,for instance, in my said application, Serial No. 421,483, or

it may be splined to the shaft. The crank shaft is hollow so that theoutiowing liquid will pass through the port 3 and over the base of thevalve into the upper end of the crank shaft and then flow down throughthe crank shaft to reach the outlet port of the meter. The valve restsupon a seat formed at the top of the central chamber of the water meterand the ports or openings 2 and 3 of the valve 100 will at timesregister with the successive passages leading from the bonnet or dome 5to the outer ends of the cylinders of the meter. The liquid is admittedto the dome 5 and flows over the valve and through the port 2 and suchpassage as may be at the time in communication with said port to reachand enter the outer end of the corresponding cylinder. The cylinders areconnected in pairs so that the pistons in the connected cylinders willWork in unison but in opposition, that is to say, one piston will bemoving inwardly in its cylinder to permit the cylinder to fill while theconnected piston will be moving outwardly in the corresponding cylinderto force the liquid therefrom. The expelled liquid will pass through theport 3 of the valve and thence into the crank shaft, as has been stated.Heretofore, the valve has been constructed with a dome whereby theoutflowing liquid was directed into -the crank shaft, but for thereasons stated this construction was not entirely satisfactory.According to the present invention, a short cylinder 6 is formed on thevalve eccentric thereto with the wall of the cylinder at one pointmerging into the periphery of the valve, the port 2 being at the outer.side of the cylinder and Ithe port 3 being inside the cylinder. Mountedwithin the cylinder is a piston 7 which is firmly secured on the upperextremity of an extension' 8 of the crank shaft, which.

extension is eccentric to the crank lshaft and concentric to the piston,as shown. The eX- tension 8 is formed at its upper` end with a tenon 9and the piston 7 is fitted over said tenon to rest on the annularshoulder 11, produced on the extension by the formation of the tenon,and is secured in position by a nut 12 in an obvious manner so as torotate with the crank shaft. To guard against leakage, a washer 13 maybe fitted upon the shoulder 11 of the tenon immediately under the pistonand this washer may be of any suitable material. In Fig. 2, the piston10 is illustrated as having annular grooves 14 in its periphery and insaid grooves are seated piston rings 15 whichbear snugly against theinner circumference of the cylinder 6 so that leakage of the liquid pastthe cylinder will be avoided. The cylindrical wall of the valve may beconnected in any convenient manner with an actuating element of thecounting mechanism of the meter, a crank shaft 16 having its innerendextending into the port 2 to be carried around thereby beingindicated by dotted lines.

In Fig. 3, the piston is illustrated as having a peripheral recess inits lower side in which is fitted a cup washer` 17 which bears againstthe inner circumference of the cylinder 6 and is clamped in the recessby a ring nut 18 threaded onto the pist-on in an obvious manner. In itsupper portion, the periphery of the piston is constructed with anannular recess 19 in which is fitted an expansible coil forming a ringor annulus 20 which bears against the upper edge portion of the cupwasher 17 and holds the same firmly against the inner circumference ofthecylinder 6 so that leakage will be avoided.

From the foregoing (description, taken in connection with theaccompanying drawing, it will be seen that I have provided an eX-ceedingly simple structure whereby an efiicient valve is attained. Thepressure formerly applied to the valve by the infiowing liquid is,according to the present invention, received by the piston 7 which ismounted upon the extension of the crank shaft and, therefore, the weightis transmitted to the bearings of the crank shaft instead of beingapplied to the valve proper and tending to cause the same to bind.Should the back pressure on the valve exceed the pressure exerted abovethe same by the inflowing liquid, the valve may unseat slightly and nloved upward with respect to the crank shaftand the piston so as torelieve the pressure and immediately reseat Withoutcausing any leakageof the liquid or any inaccuracy in the measurement indicated by themeter. The valve may be applied to any meter ofthe same general type asthat hereinbefore mentioned and operates ina highly efficient manner atall times.

Having thus described the invention, I claim:

1. A circular disk valve for liquid meters adapted to be connected witha4 crank shaft for rotation therewith, said valve having `spaced ports,a cylinder rising eccentrically valve body eccentric thereto andconcentric with said extensiomand a piston carried by the extension ofthe crank shaft and fitting snugly within the cylinder but permittingaxial sliding movement of the cylinder.

3. The combination of a -rotatable disk valve provided withdiametrically o posite ports, a cylinder rising from the va veeccentrically thereto and separating said ports, the cylinder at onepoint merging into `the periphery of the valve, a hollow crank shaft towhich the valve is fitted to rotate there-l with, a piston -carried bythe crank shaft and fitting snugly within said cylinder to dene apassage for liquid from one port to the end of the crank shaft, and asupport extending from the end ofthe crankshaft to which the piston issecured, the cylinder being slidable across the periphery of the piston.

4. The combination of a crank shaft having an extension projectin fromits end, a disk valve mounted upon t e crank shaft to rotate therewithand having movement endwise of the shaft, a cylinder risingeccentrically from the valve, a piston secured on said extension anddisposed concentrically within the cylinder, and means for sealing theperiphery of the piston to the cylinder. 5. The combination of acircular disk valve, a cylinder rising eccentrically therefrom, thevalve having a port at the outer 'side of the cylinder and aport withinthe. cylinder, a piston in the cylinder, means for' sealing theperiphery of the piston/io the cylinder, a crank shaft to which thevalve is ditted to rotate therewith, and an extension from the crankshaft su porting the piston. In testimony whereof? aix my signature.

DONALD H..MCGOGY. y[1..s.]

